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  1. Dictionary
    optional
    /ˈɒpʃən(ə)l/

    adjective

    • 1. available to be chosen but not obligatory: "a wide range of optional excursions is offered"

    More definitions, origin and scrabble points

  2. something that can be added, at extra cost, to a basic product or service to make it more attractive, efficient, etc.: Some car manufacturers offer advanced stereo systems as an optional extra on their more expensive models.

  3. The meaning of OPTIONAL is involving an option : not compulsory. How to use optional in a sentence.

  4. something that can be added, at extra cost, to a basic product or service to make it more attractive, efficient, etc.: Some car manufacturers offer advanced stereo systems as an optional extra on their more expensive models.

  5. Optional definition: left to one's choice; not required or mandatory. See examples of OPTIONAL used in a sentence.

  6. If something is optional, you can choose whether or not you do it or have it. A holiday isn't an optional extra. In this stressful, frantic world it's a must. Sex education is a sensitive area for some parents, and thus it should remain optional. Collins COBUILD Advanced Learner’s Dictionary.

  7. If you can choose whether or not to do something, it is optional. Extra credit is always optional; death and taxes are not. When you buy a new car, you can decide which options or choices, you would like.

  8. Define optional. optional synonyms, optional pronunciation, optional translation, English dictionary definition of optional. adj. Left to choice; not compulsory or automatic. op′tion·al·ly adv. American Heritage® Dictionary of the English Language, Fifth Edition.